We have added the option of monitoring the reverse entry for an ip address.
Mail servers often check the reverse dns entry for a connecting ip address to help validate the sending server. The receiving server will do a reverse lookup on the ip address to obtain the server name and then do a forward dns lookup on the name to check it translates to the sending servers ip address.
If your reverse dns entry is incorrect or is unavailable your mail delivery may be affected. Many isps do not delegate reverse ip dns entries so you are reliant on their dns service to provide this facility.
Use our new monitor to ensure that your reverse dns entry is always working for your outgoing mail server and returning the correct result.